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Tytuł:
New open-source ANSYS-SolidWorks-FLAC3D geometry conversion programs
Autorzy:
Bock, S.
Powiązania:
https://bibliotekanauki.pl/articles/91921.pdf
Data publikacji:
2015
Wydawca:
Główny Instytut Górnictwa
Tematy:
numerical modelling
material modelling
mesh design
geometry converter
FDM
FLAC3D
modelowanie numeryczne
modelowanie materiałów
Opis:
Numerical calculations are used increasingly often to obtain a stress-strain state in many engineering problems. A popular program for this type of calculation which makes use of the finite difference method (a continuous method) is Itasca's FLAC3D. However, an important limitation of FLAC3D is the difficulty of geometry creation. This paper presents new open-source programs allowing the preparation of numerical models in a third-party software (ANSYS, SolidWorks) and their conversion to internal FLAC3D geometry files. The converters have been written in BASH-scripting language and published under the terms of the GNU General Public License, which allows the free distribution and/or modification of the software with some limitations.
Źródło:
Journal of Sustainable Mining; 2015, 14, 3; 124-132
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modelling of a void behind shaft lining using FDM with a concrete spalling algorithm
Autorzy:
Bock, S.
Powiązania:
https://bibliotekanauki.pl/articles/92081.pdf
Data publikacji:
2014
Wydawca:
Główny Instytut Górnictwa
Tematy:
mine shaft
shaft lining
numerical modelling
material modelling
FDM
zbrojenie szybowe
obudowa szybu
modelowanie numeryczne
modelowanie materiałów
Opis:
Purpose: The aim of the research presented in this paper was to determine the impact of voids behind the lining on shaft stability. Methods: This paper presents an example of extending the FLAC3D with the possibility of the simulation of concrete detachment and separation under specific conditions by means of a developed FISH routine. Results: The appearance of voids and cavities behind the lining has been repeatedly observed in active shafts in Polish coal mines and can lead to the emergence of tensile forces in the lining. The study included 366 models of shafts using the rock mass properties of typical shale stone, coal, and sandstone found in the Upper Silesian Coal. Practical implications: The presented concrete spalling algorithm may be used, especially, for the stability evaluation of locally damaged shaft lining or when there is a suspicion of void behind the lining. Originality/ value: An important limitation of all continuous methods is the inability (except when using some additional tools) to simulate the rotations of predefined elements (blocks) and their separation from the rest of the object. The concrete spalling algo-rithm presented extends the capabilities of FLAC3D with the possibility of simulating the detachment and separation of destroyed lining fragments.
Źródło:
Journal of Sustainable Mining; 2014, 13, 2; 14-21
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes simulations with multiscale materials models using a dedicated interface
Autorzy:
Smyk, Grzegorz
Szeliga, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/29520085.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
multiscale modelling
material models
model integration
recrystallization
Opis:
The main goal of this work is the integration of in-house software with commercial numerical software based on the finite element method (FEM). The main idea is to develop a universal interface to perform process simulations with multiscale models. The interface allows the combination of external procedures with commercial software with minimum programmer’s work putting in integration. As an example, the model of material recrystallization of steel was implemented, added to the commercial application, and the software was tested for a process defined as a sequence of compression and cooling. The material model takes into consideration each type of recrystallization that occurs during a sequence of thermal and mechanical processing such as static recrystallization (SRX), dynamic recrystallization (DRX), and meta-dynamic recrystallization (MDRX). It allows the prediction of recrystallized volume fraction (X) and grain growth on each step of numerical simulation for each Gauss point in the computation domain. The presented multiscale model of process sequences not only allows to calculate microscale model parameters such as grain growth and recrystallized volume fraction, but also reflects the impact of the microscale model on macroscale parameters.
Źródło:
Computer Methods in Materials Science; 2021, 21, 4; 181-192
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and Experimental Modeling of Plastic Deformation the Multi-Layer Ti/Al/Mg Materials
Autorzy:
Mróz, S.
Stefanik, A.
Szota, P.
Kwapisz, M.
Wachowski, M.
Śnieżek, L.
Gałka, A.
Szulc, Z.
Powiązania:
https://bibliotekanauki.pl/articles/354174.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-layered Ti/Al/Mg material
plastic deformation
physical modelling
numerical modelling
Opis:
The paper has presented the results of theoretical studies and experimental tests of the plastic deformation of multi-layered Ti/Al/Mg specimens. Theoretical studies were carried out using the Forge2011® computer program. Physical modeling, on the other hand, was performed using the Gleeble3800 simulator. Cuboidal specimens were cut off from the plates obtained in the explosive welding method. Based on the obtained investigation results it has been found non uniform deformation of the particular layer as a result their different value of flow stress.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1361-1368
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Homogeneous substitute material model for reinforced concrete modeling
Model jednorodnego materiału zastępczego do modelowania żelbetu
Autorzy:
Siwiński, J.
Stolarski, A.
Powiązania:
https://bibliotekanauki.pl/articles/230764.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
materiał zastępczy
materiał jednorodny
analiza numeryczna
modelowanie
żelbet
substitute material
homogeneous material
numerical analysis
modelling
reinforced concrete
Opis:
This paper outlines a method of determining the deformation and strength parameters for a hypothetical, homogeneous, substitute material which approximates the properties of heterogeneous materials in reinforced concrete elements. The model of the substitute material creates a concrete reference model, in which the static - strength - deformation parameters were modified on the basis of the homogenizing function with the homogenization coefficient assumed as the effective reinforcement ratio of the reinforced concrete structural elements. The results of the comparative analysis of the numerical models using the hypothetical substitute material with experimental results for statically loaded beams and deep beams taken from the literature are presented.
W pracy przedstawiono model hipotetycznego materiału zastępczego do analizy konstrukcji żelbetowych. Model ten opracowano z wykorzystaniem metodyki homogenizacji elementów żelbetowych. Podstawą metodyki homogenizacji elementów żelbetowych jest sposób określenia właściwości odkształceniowo – wytrzymałościowych materiału zastępczego. Sposób ten polega na modyfikacji parametrów dowolnego modelu betonu (tj. tak zwanego modelu referencyjnego), np. powszechnie stosowanego modelu materiału plastycznego zniszczenia opracowanego przez Lublinera i.in., zmodyfikowanego przez Lee and Fenvesa i włączonego do systemu oprogramowania Abaqus, z wykorzystaniem funkcji homogenizacyjnej Ph = Pc + Fh ⋅ Ps.
Źródło:
Archives of Civil Engineering; 2018, 64, 1; 87-99
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disparity compute methods in three - dimensional scene reconstruction for overhead travelling crane work space visualization
Autorzy:
Szpytko, J.
Hyla, P.
Powiązania:
https://bibliotekanauki.pl/articles/246837.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
material handling devices
stereovision
disparity map
work space modelling
Opis:
The problem of ensuring the safe and efficient cranes operations in automated manufacturing processes involves the needs of the operating workspace identification, especially in the automation mode. However, this paper describes the problem of overhead travelling crane's workspace identification with the stereovision. Main authors’ attention was focused on the stereo pictures matching problem through optimization exist disparity computation methods with algorithms optimization by completion with implement correlation matching algorithms. The stereo system is based on the single camera localized under the crane trolley that allows obtaining the sequences of stereo snapshots of crane workspace during the crane or trolley movement. Typically, disparity was produce by calculating the displacement of each pixel of the stereo image along an epipolar line. The disparity software optimization was based on matching algorithms architecture. In this article, the disparity optimization procedure achieved by produce disparity on the ROI (Region of Interest) method is described. Disparity was obtained with the help of sets homologous pixels collections. These sets were determinate with variety kind of similarity measures, which was implemented to disparity search algorithm. Each disparity map (based on the separate similarity measure) was tested under outward appearance and computing time criteria.
Źródło:
Journal of KONES; 2012, 19, 3; 421-428
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Modelling of Stresses and Deformations in Nanostructured Materials
Autorzy:
Szefer, G.
Powiązania:
https://bibliotekanauki.pl/articles/907969.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
molecular modelling
deformation analysis
stress analysis
nanostructured material
modelowanie molekularne
analiza deformacji
analiza naprężeń
materiał nanostrukturalny
Opis:
A molecular dynamics approach to the deformation and stress analysis in structured materials is presented. A new deformation measure for a lumped mass system of points is proposed. In full consistency with the continuum mechanical description, three kinds of stress tensors for the discrete system of atoms are defined. A computer simulation for a set of 105 atoms forming a sheet undergoing tension (Case 1) and contraction (Case 2) is given. Characteristic microstress distributions evoked by a crack propagation illustrate the mechanical problem considered.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 4; 541-548
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Credibility of FEM Analysis in the T-Stub Modelling
Autorzy:
Ostrowski, K.
Kozłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/105371.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
T-stub
rotation capacity
material ductility
multistage hierarchical validation
FEM modelling
Opis:
The paper presents the results of a comparative analysis between numerical calculations of T-stubs of the 3rd stage of FEM models hierarchical validation and the results of laboratory tests. The procedure for the development of the material characteristics used in numerical calculations of FEM models is presented. The scope of this article allows determining the non-linear characteristics of the T-stub which maps the work of the end-plate joint of the beam to the column in the tensile zone. The results of laboratory tests of a series of T-stubs made of rolled profiles (HEB240, HEA240) and of welded profiles (thickness of end-plate: tp = 12 mm and tp = 20 mm) have been presented. The principles of shaping the geometrical features of the FEM model of end-plate joints of the T-stub type are given, with particular emphasis on the shaping of the bolt with a thread. The impact of the bolt thread on the accuracy of the obtained results was assessed. The criterion of reliability of the obtained results with respect to the maximum force in the bolt obtained on the basis of laboratory tests in the axial tensile test of the bolts in the configuration: bolt - washer - nut was formulated.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 219-232
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling selected parameters of granular elements in the mixing process
Autorzy:
Matuszek, D.
Powiązania:
https://bibliotekanauki.pl/articles/24182.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
modelling
granular mixture
funnel flow
granular structure
product quality
granular material
Opis:
This paper presents the effects of mixing non-homogeneous bicomponent granular structures by the flow method with the use of an inverted cone insert as a supporting element. The analysis of homogeneity of mixtures after 10 consecutive flows was carried out based on computer image analysis. Based on these tests, the use of a nonlinear regression for the mo-delling of two selected parameters of the process was proposed. Spatial dependence was described by the relation between the va-riance of the tracer distribution (dependent variable) and density ratio of the mixed components, and the diameter of the cone insert used (independent variables). The mathematical description was made with the use of a ‘nonlinear regression’ module. The results obtained in these tests proved that the use of supporting insert improves the degree of mixability of granular materials. The two-dimensional model in the form of a quadratic function may be a for-mula for describing the influence of selected parameters on the homogeneity of a granulate mixture before the beginning of the mixing process.
Źródło:
International Agrophysics; 2015, 29, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of Fuzzy Systems for Forecasting the Hardenability of Steel
Autorzy:
Sitek, W.
Irla, A.
Powiązania:
https://bibliotekanauki.pl/articles/356485.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computational material science
artificial intelligence methods
materials design steels
modelling
simulation
Opis:
The goal of the research carried out was to develop the fuzzy systems, allowing the determination of the Jominy hardenability curve based on the chemical composition of structural steels for quenching and tempering. Fuzzy system was created to calculate hardness of the steel, based on the alloying elements concentrations, and to forecast the hardenability curves. This was done based on information from the PN-EN 10083-3: 2008. Examples of hardenability curves calculated for exemplar steels were presented. Results of the research confirmed that fuzzy systems are a useful tool in evaluation the effect of alloying elements on the properties of materials compared to conventional methods. It has been demonstrated the practical usefulness of the developed models which allows forecasting the steels’ Jominy hardenability curve.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 797-802
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Ferrite Stainless Steel Mechanical Properties Prediction with artificial Intelligence Algorithms
Autorzy:
Honysz, R.
Powiązania:
https://bibliotekanauki.pl/articles/354759.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analysis and modelling
numerical techniques
computational material science
artificial algorithms
stainless steel
Opis:
The article presents a computational model build with the use of artificial neural networks optimized by genetic algorithm. This model was used to research and prediction of the impact of chemical elements and heat treatment conditions on the mechanical properties of ferrite stainless steel. Optimization has allowed the development of artificial neural networks, which showed a better or comparable prediction result in comparison to un-optimized networks has reduced the number of input variables and has accelerated the calculation speed. The introduced computational model can be applied in industry to reduce the manufacturing costs of materials. It can also simplify material selection when an engineer must properly choose the chemical elements and adequate plastic and/or heat treatment of stainless steels with required mechanical properties.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 749-753
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of capillary pumping on the course of cleaning porous materials containing liquid contaminants using supercritical fluids – A pore network study
Autorzy:
Krzysztoforski, Jan
Khayrat, Karim
Henczka, Marek
Jenny, Patrick
Powiązania:
https://bibliotekanauki.pl/articles/2086809.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porous material
supercritical fluid
mathematical modelling
cleaning
capillary pumping
materiał porowaty
płyn nadkrytyczny
modelowanie matematyczne
czyszczenie
pompowanie kapilarne
Opis:
The role of capillary pumping on the course of cleaning porous materials containing liquid contaminants using supercritical fluids was investigated numerically. As a specific process to be modelled, cleaning of porous membranes, contaminated with soybean oil, using supercritical carbon dioxide as the cleaning fluid (solvent) was considered. A 3D pore-network model, developed as an extension of a 2D drying model, was used for performing pore scale simulations. The influence of various process parameters, including the coordination number of the pore network, the computational domain size, and the external flow mass transfer resistance, on the strength of the capillary pumping effect was investigated. The capillary pumping effect increases with increasing domain size and decreasing external flow mass transfer resistance. For low coordination numbers of the pore network, the capillary pumping effect is not noticeable at macro scale, while for high coordination numbers, the opposite trend is observed – capillary pumping may influence the process at macro scale. In the investigated system, the coordination number of the pore network seems to be low, as no capillary pumping effects were observed at macro scale during experimental investigation and macro-scale modelling of the membrane cleaning process.
Źródło:
Chemical and Process Engineering; 2021, 42, 4; 349--368
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of human circle of Willis with and without aneurisms
Autorzy:
Ivanov, D.
Dol, A.
Pavlova, O.
Aristambekova, A.
Powiązania:
https://bibliotekanauki.pl/articles/307003.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
3D design
aneurysm
circle of Willis
hyperelastic material
mathematical modelling
mechanical tests
3D
model matematyczny
materiał hiperelastyczny
Opis:
Purpose: This paper includes results of the first stage of research aimed at the development of recommendations for physicians in order to help them to choose a particular type of cerebral arteries aneurysms treatment. Methods: Recent studies show that the majority of aneurysms develop as a result of hemodynamic and degenerative lesions of the vascular wall. Obviously, such wall damage can be studied using the methods of continuum mechanics and numerical simulations. Biomechanical modelling allows us to study hemodynamic parameters and stress-strain state of these arteries in health and disease, and to formulate practical recommendations for the necessity and reasonable selection of a particular type of cerebral arteries aneurysm treatment. Results: At this stage the realistic geometric models of arterial circle of Willis were built for its normal state and in the presence of aneurysms. The ultrasound analysis of circle of Willis was conducted in order to obtain blood flow parameters and the boundary conditions for carotid and vertebral arteries. Also, the mechanical properties of these arteries were investigated and constants of the Mooney–Rivlin strain energy function were obtained. Conclusions: Thus, the boundary problem describing the behaviour of human Willis circle arteries was stated. Further, this problem will be solved numerically using the finite element method. The numerical results will be analyzed from the point of view of the influence of the mechanical factors on the emergence, growth and rupture of circle of Willis aneurysms.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 2; 121-129
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of temperature in multicomponent functionally graded multilayered composites
Rozkład temperatury w wieloskładnikowym wielowarstwowym kompozycie o funkcyjnej gradacji własności efektywnych
Autorzy:
Wagrowska, M.
Szlachetka, O.
Powiązania:
https://bibliotekanauki.pl/articles/40251.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
temperature
distribution
heat conduction
tolerance modelling
multicomponent
functional gradation
multilayer composite
material property
Opis:
The object of analysis is a heat conduction problem within the frames of tolerance modelling in multicomponent, multilayered composites with functional gradation of effective material properties. The equations of proposed model for considered composites are partial differential equations with slowly-varying coefficients. The one-dimensional, stationary problem of heat conduction in direction perpendicular to layers will be analysed.
Przedmiotem rozważań jest modelowanie tolerancyjne przewodnictwa ciepła w wieloskładnikowych wielowarstwowych kompozytach o funkcyjnej gradacji własności efektywnych. Zaproponowane równania modelu dla analizowanych kompozytów są równaniami różniczkowymi cząstkowymi z wolnozmiennymi współczynnikami. Wyznaczono rozkład przybliżonej temperatury dla jednowymiarowego stacjonarnego zagadnienia przewodnictwa ciepła w kierunku prostopadłym do uwarstwienia.
Źródło:
Acta Scientiarum Polonorum. Architectura; 2016, 15, 1
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Elastic-Plastic Analysis of Polycrystalline Structure Using Crystal Plasticity Modelling – Theory and Benchmark Tests
Autorzy:
Wójcik, Marta
Skrzat, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2204889.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
crystal plasticity
polycrystalline material
slip system
slip system modelling
plastic deformation
microstructure
anisotropy
Opis:
Numerical simulations of tension and shear tests for a polycrystalline, anisotropic material were performed using crystal plasticity theory. The slip was considered here as the main mechanism of plastic deformation. Constitutive equations to describe the elastic-plastic deformation caused by the slip are presented. The generation and meshing of various shapes geometries (cubic and paddy shapes) with randomly-orientated grains by means of open source program NEPER program was shown. The Voronoi tessellation was used in order to include morphological properties of a crystalline material. The selected results of elastic-plastic analyses (stress, strain distributions and the macroscopic stress-strain resulting from homogenization) are presented here. The results obtained show the non-uniform distribution of stress and strain for different grains associated with their crystal orientation. The crystal plasticity finite element modelling of materials subjected to plastic deformation is important for microstructure-based mechanical predictions, as well as for the engineering design and to perform simulations involving not only the change of a material’s shape at a macro level but also the phenomena occurring in material in a micro-scale.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 5; 163--177
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
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